query child records in firestore android code example
Example: firebase query multiple keys
var keys = [
"-Ke1uhoT3gpHR_VsehIv",
"-Ke8qAECkZC9ygGW3dEJ",
"-Ke8qMU7OEfUnuXSlhhl"
];
var promises = keys.map(function(key) {
return firebase.database().ref("/items/").child(key).once("value");
});
Promise.all(promises).then(function(snapshots) {
snapshots.forEach(function(snapshot) {
console.log(snapshot.key+": "+snapshot.val());
});
});